Chapter 5. Street Lighting. § 9–501. Rates; maintenance. § 9–502. Electric lamps on overhead wires prohibited. § 9–503. Failure to provide required illumination; testing facilities. § 9–504. Mayor not required to execute contracts for lighting. § 9–505. Failure to furnish, erect, maintain, move, or discontinue street lamps. § 9–506. Extension of gas mains for maintenance of street lamps. § 9–507. Mayor to regulate hours of lighting of street lamps. § 9–508. Washington Terminal Company to pay for certain street lighting. § 9–509. Railroads to pay for certain street lighting. § 9–510. Increase in number of street lamps authorized.